*{
    margin: 0;
    padding: 0;
}
.lunbo{
    width: 500px;
    height: 400px;
    margin-top: 30px;
    margin-left: 100px;
    border: 5px solid #108881;
    position: relative;
    overflow: hidden;
}
ul{
    width: 600%;
    height: 400px;
    position: absolute;
}
ul>li{
    list-style: none;
    float: left;
    width: 500px;
    height: 400px;
    /* display: none; */
}

img{
    width: 500px;
    height: 400px;
}
a{
    text-decoration: none;
}
.left,
.right{
    position: absolute;
    top: 50%;
    display: none;
    z-index: 10;
}
.left{
    left: 10%;
}
.right{
    left: 85%;
}
.circle{
    width: 150px;
    height: 15px;
    line-height: 15px;
    text-align: center;
    position: absolute;
    top: 80%;
    left: 30%;
}
.circle li{
    list-style: none;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-left: 15px;
    background-color: #108881;
    float: left;
}
.change{
    box-shadow: -1px 0px 2px 3px white;
}